Sentence details:
1. When I sing, I am happy. I hope that my singing can infect everyone around me, so that you can also feel my happiness.
2. Those who are lovelorn will feel that all love songs are sung.
3. Joy makes me feel a little happy when I am sad, and makes me shed tears when I am moved. Music lets me know that there are all kinds of joys, sorrows, and pains in the world; music lets me know that as long as there is happiness, I will not be alone or lonely. _Happiness, for my _fate_ is a _poor thing_.
4. The reason why I like music is because the melody of love can be found in the melody, so I have a preference for music.